STATE Senate Republicans are readying detailed subpoenas to respond to what they say is Gov. Spitzer‘s all-but-certain rejection of their “demand” last week for all documents, including personal e-mails, relating to the dirty-tricks scandal.

“We know they’re going to say no despite Spitzer’s claim that he has nothing to hide,” a senior Senate official said. “The subpoenas are being prepared and will be issued, and we won’t be surprised if Spitzer tries to fight them in court.”

The subpoenas – authorized by state law – may be issued as soon as Friday, one source said.

While Spitzer has publicly claimed he would cooperate fully with several probes of the scandal, he and his aides have repeatedly resisted giving information to the Senate, Attorney General Andrew Cuomo and the state Ethics Commission, which was merged into a newly formed Public Integrity Commission late last month.

Aides to Spitzer refused Friday to say whether the requested records would be turned over to the Senate.

Investigators questioned by The Post said the e-mail and other records would likely show the governor knew far more than he has admitted about the efforts to use the State Police to damage Senate Majority Leader Joseph Bruno, his leading Republican foe.

“If and when all the truth comes out, it will show that Spitzer was aware of all that was done to Bruno,” said a prober with firsthand knowledge of the scandal.

Meanwhile, a growing number of Republicans have been privately complaining about what one called “a lack of clear and constant focus” by Bruno on the scandal.

They and other critics also complain about the poor and, at times, embarrassingly uninformed questioning by Republican senators of witnesses at the three Senate Investigations Committee hearings held on the scandal.

“It’s painful to watch,” one investigator said. “If this is the best Bruno and his people can do, you might as well have them pack their tents right now because they’re going to lose control next year.”

The widespread view that Albany District Attorney David Soares’ report on the scandal was a cover-up for Spitzer gained support last week in the form of a little-known section of the state Criminal Procedure Law (CPL).

Soares, a Spitzer political ally, claimed neither Spitzer nor his aides did anything wrong in the scandal. Soares didn’t put any witnesses under oath, insisting he could subpoena them only if he were able to convene a grand jury, which he said he couldn’t do because he had no proof of a crime.

But CPL Section 190.55 says a DA may convene a grand jury “concerning misconduct, nonfeasance or neglect in public office by a public servant, whether criminal or otherwise.”